PHY 1001

Unit Seven – Electricity/Magnetism

Mathematical Assignment

1. 200 C of charge flows for 45 seconds. Calculate the electric current (in amps). 

Key Idea   Stock of Data and 

Solution

Sanity Check

2. A current of 10 A flows through an appliance connected to a standard 120 volt outlet. Calculate the resistance (in ohms) of the appliance. 

Key Idea   Stock of Data and 

Solution

Sanity Check

3. Calculate the voltage (in volts) needed to cause a current of 0.002 A to flow through a 10,000 ohm resistor. 

Key Idea   Stock of Data and 

Solution

Sanity Check

4. Calculate the power consumption (in watts) of a 2,000 A train motor that operates on 800 volts. 

Key Idea   Stock of Data and 

Solution

Sanity Check

5. Calculate the energy in joules used by a 3,500 W appliance that is operated for 30 minutes. 

Key Idea   Stock of Data and 

Solution

Sanity Check

6. Calculate the cost (in cents) of using a 200 watt television for 30 days if turned on 2 hours per day and if electricity costs 10 cents per kilowatt-hour .

Key Idea   Stock of Data and 

Solution

Sanity Check

7. A car battery is rated at 600 AH (i.e., amps x hours). Calculate the number of coulombs this is equivalent to. 

Key Idea   Stock of Data and 

Solution

Sanity Check

8. A flashlight bulb uses 6 watts at a voltage of 12 volts. Calculate the current (in amps) used by the bulb. 

Key Idea    Stock of Data and 

Solution

Sanity Check

9. Calculate the voltage (in volts) needed to supply 2 amps through a resistance of 6 ohms. 

Key Idea   Stock of Data and 

Solution

Sanity Check

10. Calculate the number of Coulombs of charge needed for a current of 2 amps to flow for 4 minutes. 

Key Idea   Stock of Data and 

Solution

Sanity Check